Various scripts in various languages.
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3.8 KiB

#!/bin/sh
#
# xzize.sh, Copyright © 2010, 2019 Matteo Cypriani
#
# This program is free software. It comes without any warranty, to
# the extent permitted by applicable law. You can redistribute it
# and/or modify it under the terms of the Do What The Fuck You Want
# To Public License, Version 2, as published by Sam Hocevar. See
# http://sam.zoy.org/wtfpl/COPYING for more details.
#
# This script recompresses to XZ one or several GZip (.gz, .tgz), BZip2 (.bz2,
# .tbz, .tb2), LZMA (.lzma, .tlz), or Lempel-Ziv (.Z, .taz) compressed file(s).
# The original files are kept.
#
# If a file extension does not correspond to a known compression format, that
# file is compressed to XZ. In that case, the original file is removed.
#
# If the file is already XZ-compressed (.xz, .txz), nothing is done.
#set -x
set -u
# Destination file suffix when source file name suffix is a
# 3-letter compressed tar suffix:
readonly TAR_XZ_EXT=txz
# Default compression level:
COMPRESSION_LEVEL=
test_extension()
{
FILE="$1"
EXTENSION="$2"
NEWEXTENSION=xz
if [ $# -eq 3 ] ; then
NEWEXTENSION="$3"
fi
BASE="$(echo "$FILE" | sed "s/\.${EXTENSION}//")"
if [ "$BASE" != "$FILE" ] ; then
DEST="$BASE".$NEWEXTENSION
return 0
fi
DEST="$FILE"
return 1
}
do_recompress()
{
if [ -e "$DEST" ] ; then
echo "Skipping source file « $SOURCE »: destination file « $DEST » already exists!" >&2
return 0
fi
echo "Recompressing « $SOURCE » to « $DEST »…"
$ACTION -c "$SOURCE" | xz $COMPRESSION_LEVEL >"$DEST"
return $?
}
## Verify number of arguments ##
if [ $# -lt 1 ] ; then
echo "$0 requires at least one argument!" >&2
exit 2
fi
## Process files ##
for SOURCE in "$@" ; do
# Does source file exist?
if [ ! -e "$SOURCE" ] ; then
echo "Skipping source file « $SOURCE »: does not exist!" >&2
continue
fi
# Is source file regular?
if [ ! -f "$SOURCE" ] ; then
echo "Skipping source file « $SOURCE »: is not a regular file!" >&2
continue
fi
# GZip
if test_extension "$SOURCE" gz ; then
ACTION="gunzip"
do_recompress
continue
fi
# GZipped Tar (.tgz)
if test_extension "$SOURCE" tgz $TAR_XZ_EXT ; then
ACTION="gunzip"
do_recompress
continue
fi
# BZip2
if test_extension "$SOURCE" bz2 ; then
ACTION="bunzip2"
do_recompress
continue
fi
# BZipped Tar (.tbz)
if test_extension "$SOURCE" tbz $TAR_XZ_EXT ; then
ACTION="bunzip2"
do_recompress
continue
fi
# BZipped Tar (.tb2)
if test_extension "$SOURCE" tb2 $TAR_XZ_EXT ; then
ACTION="bunzip2"
do_recompress
continue
fi
# LZMA
if test_extension "$SOURCE" lzma ; then
ACTION="unlzma"
do_recompress
continue
fi
# LZMA compressed Tar (.tlz)
if test_extension "$SOURCE" tlz $TAR_XZ_EXT ; then
ACTION="unlzma"
do_recompress
continue
fi
# Compress
if test_extension "$SOURCE" Z ; then
ACTION="uncompress"
do_recompress
continue
fi
# Compressed Tar (.taz)
if test_extension "$SOURCE" taz $TAR_XZ_EXT ; then
ACTION="uncompress"
do_recompress
continue
fi
# XZ
if test_extension "$SOURCE" xz ; then
echo "Skipping source file « $DEST »: has already .xz suffix!" >&2
continue
fi
# XZipped Tar (.txz)
if test_extension "$SOURCE" txz $TAR_XZ_EXT ; then
echo "Skipping source file « $DEST »: seems to be a XZipped Tar archive (.txz suffix)!" >&2
continue
fi
# Uncompressed file: fall back to simple compression
echo "Compressing « $SOURCE » to xz…"
xz $COMPRESSION_LEVEL "$SOURCE"
done
# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4